function disableInput(selection)
  {
    werte = new Array(false, false, false, false, false, true, true, true, true, true, false, false, false, false, false);
    if(selection == 20)
      werte = new Array(false, false, false, true, true, true, true, true, true, true, true, false, false, false, false);
    if(selection == 30)
      werte = new Array(false, false, false, false, false, false, false, false, false, false, false, false, false, false, false);
    
    document.getElementById('year_start').disabled = werte[0];
    document.getElementById('month_start').disabled = werte[1];
    document.getElementById('day_start').disabled = werte[2];
    document.getElementById('hour_start').disabled = werte[3];
    document.getElementById('minute_start').disabled = werte[4];
    
    document.getElementById('year_end').disabled = werte[5];
    document.getElementById('month_end').disabled = werte[6];
    document.getElementById('day_end').disabled = werte[7];
    document.getElementById('hour_end').disabled = werte[8];
    document.getElementById('minute_end').disabled = werte[9];
    
    for (var i = 0; i < document.add_entry.z1.length; i++) {
      document.add_entry.z1[i].disabled = werte[10];
    }
    for (var i = 0; i < document.add_entry.z2.length; i++) {
      document.add_entry.z2[i].disabled = werte[11];
    }
    for (var i = 0; i < document.add_entry.z3.length; i++) {
      document.add_entry.z3[i].disabled = werte[12];
    }
    for (var i = 0; i < document.add_entry.z4.length; i++) {
      document.add_entry.z4[i].disabled = werte[13];
    }
    for (var i = 0; i < document.add_entry.z5.length; i++) {
      document.add_entry.z5[i].disabled = werte[14];
    }
    
  }